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Absolute Value

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Absolute Value

by nz11 » Sun Mar 27, 2011 12:03 pm
If x<0, then square root ( -x |x|) is:
a) -x
b) -1
c) 1
d) x
e) square root (x)

Can someone please provide an explanation?
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by force5 » Sun Mar 27, 2011 12:09 pm
since x is -ve (-x|x|) = x^2 ( because -x will become -(-x) and |x| is always +ve)

sq rt of x^2 =x now since our x was -ve ... hence the answer is -(-x). there fore answer should be -x ( only because it was given that x is -ve)
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by manpsingh87 » Sun Mar 27, 2011 7:30 pm
nz11 wrote:If x<0, then square root ( -x |x|) is:
a) -x
b) -1
c) 1
d) x
e) square root (x)

Can someone please provide an explanation?
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